The Dayton Audio Classic Series subwoofers offer solid value at lower price points. No compromises were made in the design, materials, or construction of these rugged 4-ohm powerhouses. Product Highlights Sturdy stamped steel frame Vented pole piece and bumped back plate Inductance-reducing copper pole piece cap Treated non-pressed paper/Kevlar cone with rubber surround 4-layer VC with polyimide former Great for home and automotive applications Five year warranty The Dayton Audio Classic Series subwoofers offer solid value at lower price points. No compromises were made in the design, materials, or construction of these rugged 4-ohm powerhouses. The drivers feature a vented pole piece with copper cap, bumped back plate for improved excursion capability, Kevlar reinforced cone with rubber half-roll surround, and a high-temperature 4-layer copper voice coil wound on a polyimide former.